Use in the construction of heat-efficient cavity ceramics and porous concrete
porous concrete, cavity ceramics, autoclaved aerated concrete
Some scientiﬁc and technical aspects of a problem resourse saved are considered at mass building and operation of heated building objects. The attention to necessity of application of products from porous concrete, ﬁrst of all from autoclave cellular concrete and gydrofobian cement perlite is paid.
As a result of the theoretical analysis, it has been established that the strength of porous composite materials of construction purpose with a noodle or granular structure essentially depends on factors in the form of certain functions or parameters.
It was established that the activated cement mixture contains dispersed clinker particles with a 1,4 to 1,5 times reduced electrokinetic potential, which helps to form a more dense and strong with a reduced shrinkage of the structure of the cement stone. The disadvantage of the press technology is the impossibility of producing products of diﬀerent sizes and the need to use a scarce ﬁber ﬁller in the production of large-sized heat-insulating slabs. It is known that thermal insulating cement pearlite concrete has improved physical and technical properties (reduced thermal conductivity, open porosity, drying shrinkage, anisotropy of strength, increased compression strength and homogeneity of average density, adjustable sorption moisture content), which allows to eﬀectively apply It is a heat-insulating layer of fencing structures.
Taking into account the increased shrinkage of cementing material to reduce the eﬀect of its properties on the phys- ical and technical properties of alkyd concrete, the costs of the binding agent should be reduced. Further reduction of shrinkage of the cementing material is achieved by forming a microstructure containing phases, for example, hydrogranates with reduced shrinkage and greater strength.
During the operation of composite materials of construction purpose, a situation may arise when the percentage of sorbed water passes into a chemisorbed or crystallization dissociation with the actual formation of new compounds in the structure of composite materials of construction purpose. To exclude this phenomenon, it is necessary to reduce the amount of non-hydrated particles of cement in concrete.
Thus, the organization of production of competitive prefabricated and monolithic products of a diverse range of porous concrete with improved physical and technical properties contributes to solving the problem of resource conservation and reducing the cost of construction.
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